KROHNE OPTITEMP TT 50 C-R EN - Manual (Page 19)

ELECTRICAL CONNECTIONS
4
19
OPTITEMP TT 50 C/R
www.krohne.com 09/2010 - 4000636502 - MA OPTITEMP TT 50 C/R R03 en
4.5 Connection diagram of rail-mount transmitter
4.6 Cable length
In order to ensure reliable HART ® communication, the maximum cable length of the output
circuit must be observed.
DANGER!
Neither operate this transmitter in potenially explosive areas, nor connect it to a sensor located
in a potentially explosive area! Otherwise the transmitter might cause an explosion that can
result in fatal injuries!
DANGER!
To enable HART
® communication, the output circuit must have an output load of at least 250 Ω.
1 Voltage supply 11...42 VDC
2 R
Load
3 Modem
4 Input
5 Measuring device
6 Test circuit
INFORMATION!
The HART
® modem is connected parallel to the output load or parallel to the output of the
transmitter.
DANGER!
In the Ex version, please note that the maximum cable length is determined by a resistance, an
inductance and a capacitance of the cable. The total capacitance and inductance of the cable
must be within the limits for the transmitter described in the Ex certificate.
.book Page 19 Monday, September 13, 2010 5:07 PM